diff --git a/front/src/WebRtc/MediaManager.ts b/front/src/WebRtc/MediaManager.ts
index 4aa240cd..09378642 100644
--- a/front/src/WebRtc/MediaManager.ts
+++ b/front/src/WebRtc/MediaManager.ts
@@ -209,10 +209,19 @@ export class MediaManager {
     }
 
     public enableCamera() {
-        this.enableCameraStyle();
         this.constraintsMedia.video = videoConstraint;
+
         this.getCamera().then((stream: MediaStream) => {
+            //TODO show error message tooltip upper of camera button
+            //TODO message : please check camera permission of your navigator
+            if(stream.getVideoTracks().length === 0) {
+                throw Error('Video track is empty, please check camera permission of your navigator')
+            }
+            this.enableCameraStyle();
             this.triggerUpdatedLocalStreamCallbacks(stream);
+        }).catch((err) => {
+            console.error(err);
+            this.disableCameraStyle();
         });
     }
 
@@ -228,11 +237,19 @@ export class MediaManager {
     }
 
     public enableMicrophone() {
-        this.enableMicrophoneStyle();
         this.constraintsMedia.audio = true;
 
         this.getCamera().then((stream) => {
+            //TODO show error message tooltip upper of camera button
+            //TODO message : please check microphone permission of your navigator
+            if(stream.getAudioTracks().length === 0) {
+                throw Error('Audio track is empty, please check microphone permission of your navigator')
+            }
+            this.enableMicrophoneStyle();
             this.triggerUpdatedLocalStreamCallbacks(stream);
+        }).catch((err) => {
+            console.error(err);
+            this.disableMicrophoneStyle();
         });
     }
 
@@ -318,6 +335,9 @@ export class MediaManager {
         const localScreenCapture = this.localScreenCapture;
         this.getCamera().then((stream) => {
             this.triggerStoppedScreenSharingCallbacks(localScreenCapture);
+        }).catch((err) => { //catch error get camera
+            console.error(err);
+            this.triggerStoppedScreenSharingCallbacks(localScreenCapture);
         });
         this.localScreenCapture = null;
     }
diff --git a/front/src/WebRtc/SimplePeer.ts b/front/src/WebRtc/SimplePeer.ts
index 2d8e5162..90d260ee 100644
--- a/front/src/WebRtc/SimplePeer.ts
+++ b/front/src/WebRtc/SimplePeer.ts
@@ -229,6 +229,14 @@ export class SimplePeer {
         } catch (err) {
             console.error("closeConnection", err)
         }
+
+        //if user left discussion, clear array peer connection of sharing
+        if(this.Users.length === 0) {
+            for (const userId of this.PeerScreenSharingConnectionArray.keys()) {
+                this.closeScreenSharingConnection(userId);
+                this.PeerScreenSharingConnectionArray.delete(userId);
+            }
+        }
     }
 
     /**
@@ -245,9 +253,11 @@ export class SimplePeer {
             // FIXME: I don't understand why "Closing connection with" message is displayed TWICE before "Nb users in peerConnectionArray"
             // I do understand the method closeConnection is called twice, but I don't understand how they manage to run in parallel.
             peer.destroy();
-            if(!this.PeerScreenSharingConnectionArray.delete(userId)){
+
+            //Comment this peer connexion because if we delete and try to reshare screen, the RTCPeerConnection send renegociate event. This array will be remove when user left circle discussion
+            /*if(!this.PeerScreenSharingConnectionArray.delete(userId)){
                 throw 'Couln\'t delete peer screen sharing connexion';
-            }
+            }*/
             //console.log('Nb users in peerConnectionArray '+this.PeerConnectionArray.size);
         } catch (err) {
             console.error("closeConnection", err)
@@ -301,11 +311,13 @@ export class SimplePeer {
                 peer.signal(data.signal);
             } else {
                 console.error('Could not find peer whose ID is "'+data.userId+'" in receiveWebrtcScreenSharingSignal');
+                console.info('tentative to create new peer connexion');
+                this.sendLocalScreenSharingStreamToUser(data.userId);
             }
         } catch (e) {
             console.error(`receiveWebrtcSignal => ${data.userId}`, e);
-            //force delete and recreate peer connexion
-            this.PeerScreenSharingConnectionArray.delete(data.userId);
+            //Comment this peer connexion because if we delete and try to reshare screen, the RTCPeerConnection send renegociate event. This array will be remove when user left circle discussion
+            //this.PeerScreenSharingConnectionArray.delete(data.userId);
             this.receiveWebrtcScreenSharingSignal(data);
         }
     }
@@ -416,8 +428,8 @@ export class SimplePeer {
 
         if (!PeerConnectionScreenSharing.isReceivingScreenSharingStream()) {
             PeerConnectionScreenSharing.destroy();
-
-            this.PeerScreenSharingConnectionArray.delete(userId);
+            //Comment this peer connexion because if we delete and try to reshare screen, the RTCPeerConnection send renegociate event. This array will be remove when user left circle discussion
+            //this.PeerScreenSharingConnectionArray.delete(userId);
         }
     }
 }